Junction-box for circuit-conductors.



T. E. MURRAY.

J UNGTIONBOX FOR CIRCUIT GONDUGTORS.

APPLICATION FILED MAR. 9, 1912.

1,028,260, Patented June 4, 1912.

. Original application filed September 11, 1911, Serial No. 648,797. Divided and j 9, 1912. Serial No. 682,645. v

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' Patented iIune4, 1912. this application mama-eh new and useful Improvement in- Junctionfollowing is a specification.

Boxes for Circuit-Conductors, ofwhich the The invention is a junction box, designed to protect a joint formed between main and branch line conductors and more especially those having a coverof insulating material A and an outer sheath of. metal. a

The invention consists in'the construction, hereinafter set forth, whereby the jointis inclosed in 'a casing of refractory insulating material so as to be'completely protectedirom current leakage, moisture or the weather, and whereby said casing may be easily applied and removed. I. A

This application is-a division of my copending' application, filed Sept. 11, 1911.

In the accompanying drawings my invention is shown applied to the joint formed between a main line and branch conductor.

Figure 1 is vice. Fig. 2 is a longitudinal section thereof. Fig. 3 is a cross section on line :17, w of 2. imilar letters of reference indicate like parts.

A is a casing, formed of porcelain or other refractory insulatingmaterial in two parts, namely, -(l) a tubular portion B which is open at both ends, and has a gap in its wall, and a tubular ofi'set C integral with said portion B: and (2) a closing piece E for said gap. The inner end of the bore of ofiset C is enlarged or flared, as shown at H.

The device is applied to the joint in the following manner. Withinthe casing A the main conductor I is denuded of its lead sheath J so as to expose the insulating cover K. The middle portion of said exposed insulating cover 'is removed to expose the metallic conductor over a distance suflicient to enable the bared end of the branch conductor L to be coiled about said main conductor. A portion of the insulating cover M of said conductor L just beyond said bared portion is also exposed. The diameter and an outer casing of metal,

Serial No. 648,797,

- cover S. 7

a perspective view of the de."

of the bores in the tubular portion and off- I I set C is such that the insulating covers M, K

fit snugly therein. The closing piece E being removed, the main conductor is laid in the bore of tubular ortion B, and the bared end of branch con uctorL after being led through the bore of offset 0 is twisted, as

before noted, around said main conductor to form the joint therewith. v S is an inclosing cover of iron or other suitable metal, of similar shape to casing A, and formed in sections T, U. The openings in said cover are made .lar er in diameter than the sheaths ofthe con uctors, but less' in diameter than the outer end facesof the casing A, so that said outer faces form shoulders against which the extremities of the lead sheaths rest, as shown in Fig.2. The

clearance space around the sheaths in said.

openings is packed with leadfloss, as shown at Y, to form moisture-proof joints. A metal .s'trap P, provided with clamping screw R, connects the twoparts of the I claim: A junction box for :main and branch conductors,of the type in which the conductor has an vinsulating covering and an outer metal sheath, comprising a casing of refractory insulating material formed integrally of a tubular portion open at both ends and-having a gap 1n its wall, and a tubular offsetwith said tubular portion,

communicating a closing piece for said gap, means for detachably securing said closln piece in said gap, and an outer casing 0 ing said casing of insulating material and formed in separable sections: the bores of said tubular portion and offset being of a diameter to fit the insulating cover of said conductors, the openings in said metal casing being of less diameter than the end faces of said tubular portion and offset and of larger diameter than the sheath of said conductors, and a packing of leadfloss in the clearance spaces between said conductor sheaths and said outer casing openings.

In testimony whereof I have afiixed my signature in presence of two witnesses.

- THOMAS E. MURRAY. Witnesses GERTRUDE T. PORTER, MAY T. MCGARRY.

metal inclos- 

